LeeKeifon
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6 years ago Tuesday
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He then set up experiments with caged starlings and found that their orientation was, in fact, in the proper migratory direction except when the sky was overcast, at which times there was no clear direction to their restless movements. 于是，Kramer用星椋鸟做实验，将它们关在笼子里，总结出了它们的迁徙方向，事实上，它们基本都能朝向正确的迁徙方向，阴天除外，因为阴天的时候它们的骚动不安使得它们难以清楚分辨方向。
Many complex factors led to the adoption of the new economies, not only at Abu Hureyra, but at many other locations such as 'Ain Ghazal, also in Syria, where goat toe bones showing the telltale marks of abrasion caused by foot tethering (binding) testify to early herding of domestic stock. 有很多复杂的因素导致人们采用新的经济形式，这不只是发生在阿布胡赖拉，在其它很多地方例如在艾因加扎勒和叙利亚发现的山羊的趾骨上就有显示足部被栓（绑）造成的磨损的迹象，这就证明该地出现了早期的畜牧业。
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